This grand hydraulic installation has provided water for townspeople since the Middle Ages.

Founded in 670, this ancient mosque is an architectural time portal.

An ancient burial ground believed to have been used for ritual sacrifice.

Made famous by 'Star Wars,' these troglodyte homes face an uncertain future.

A 15th-century granary that played the role of futuristic slave quarters in the world of 'Star Wars.'

The best-preserved Roman small town in North Africa.

The original film set of Luke Skywalker's Tatooine home from the 'Star Wars' trilogy.

Gargantuan home of Russian science.

The tallest hotel in Europe.

The gorgeous entrances into the city's underbelly look more like grand halls than subway stops.

This building holds the embalmed remains of the leader of the Bolshevik Revolution.

Dozens of snakes are housed and worshipped within the walls of this Vodun temple.

Africa's Venice on stilts.

The clever workshop that has been designing some of the most unusual coffins imaginable.

Where thousands of slaves passed through the "Door of No Return."

This series of rope-style bridges brings visitors into a jungle layer that is usually reserved for birds and monkeys.

The Voodoo Superstore of the world.

These mysterious 1,000-year-old walls have revealed little about their past.

In this African village, the walls of the chief's compound are painted with beautiful traditional designs.

This giant statue is the product of a mixture of corruption, Stalinist architecture, and North Korean manpower.

Despite a fraught and controversial history this African island holds a powerful monument to the tragedy of the slave trade.

This deceptively salty lake looks like blushing pink lemonade.

Every Friday, Sufi dervishes whirl around the tomb in a trance-like state as part of a sacred ritual called dhikr.

Crumbling pyramids and temple ruins stand within the shadow of this sacred butte.